Thanks Chilled.
Of course, we'd all like to see those pics posted!
The sighting pin hole thing got me curious, so I removed the bead from a set of beat up original length (shooter grade) GH barrels that I intend to reblack some day. I attempted to inject some acetone down the sighting pin hole to see if it accessed the void between the barrels. It clearly does not. The void between the barrels of pre-Remington Parkers appears to be sealed. Which would seem to indicate that Parker Brothers rust blued their barrels without any venting. They apparently had more faith in the workmanship of their soldering than most (if not every) other American gun maker of the period.
Of course I'm just speculating here, but it would seem logical to conclude that if the solder is still air tight and strong, no bubbling will be observed when the barrels are submerged in near boiling water. If the soldering has lost its air tight seal over the decades, that would be easily detected by escaping air bubbles, and a vent hole would then be necessary in order to drain out the water at the end of the bluing process and flush it with water displacing oil. So perhaps the answer is simply that if you are fortunate enough to have a Parker with soldered seams that are still air tight, you won't need to have a vent/drainage hole drilled.
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